Download the file zip file and copy it to the micro SD card that comes with the phone.

Power off the smartphone device and insert the micro SD card (with the firmware zip file) back to the phone.

Press Volume “+” button and “Power” button simultaneously until you see the Android system recovery screen as seen below.

(Note: For illustration purposes. Screen may differ slightly in different phone model)

Use the volume “+” or “-“ button to select “apply update from sdcard” option，and press the power button to confirm selection.

Select zip file and press the power button to install the firmware.

(Note: For illustration purposes. Screen may differ slightly in different phone model)

During the upgrade process, you should see the following screen.

(Note: For illustration purposes. Screen may differ slightly in different phone model)

Once completed, you should see the following screen indicating that the upgrade is successful with the message “Install from sdcard complete”.
Upon completion, the smartphone device will reboot by itself (some
phone models may reboot a few of times to complete the installation) .

(Note: For illustration purposes. Screen may differ slightly in different phone model)